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> The rockets on Starship re-use the gas that drives the pumps, pushing them into the combustion chamber

How is that possible? From a total layman's point of view, the pressure in the combustion chamber should always be greater than whatever the pump can put out, thus leading to a pump stall... what am I missing?

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Actually the pump has to be able to put out as much if not more pressure than the pressure generated in the combustion chamber, otherwise it wouldn't be able to push a steady stream of fuel and oxidizer into the chamber.

I recommend watching or reading https://everydayastronaut.com/raptor-engine/

As the other post says, this cannot be true, otherwise how could the engine work. You'd not get any propellant into the combustion chamber.

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